Means for drying paper-board, &amp;c.



No. 770,772. PATENTEDSEPT. 27,1904. T. W. MOFARLAND.

MEANS FUR DRYING PAPER BOARD, 6m.

APPLIATION FILED JAN. 2, 1903.

3 SHEETS-SHEET l.

N0 MODEL.

No. 770,772. PATENTED SEPT. 27, 1904,

' T. W. MOPARLAND.

MEANS POR DRYING PAPER BOARD, 6m.

APPLICATION FILED JAILVZ. 1903.

N0 MODEL. v 3 SHEETS-SHEET 2,

No. 770,772. PATENTED SEPT. 27, 190A. T. W. MGPAEEAND. MEANS PoE DEYING PAPER BOARD, Aw.

APPLICATION FILED JAN. 2, 1903.

N0 MODELV 3 SHEETS-SHEET 3.

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UNITED STATES Patented September 27, 1904.

PATENT OEEieE.

THOMAS W. MCFARLAND, OF CHICAGO, ILLINOIS.

SPECIFICATION forming part of Letters Patent No. 770,77 2, dated September 27, 1904.

Application filed January 2, 1903. Serial No. 137,474. (No model.)

To all whom t 71mg/ cfm/cern:

Be it know-n that I, THOMAS W. MCFARLAND, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Means for Drying Paper-Board and other Like Material, of which the following is ai'ull, clear. and exact specification.

My invention is more especially designed for drying large sheets of paper-board; but it will nevertheless be understood that it is also appropriate for drying sheets of other material of a plastic or iieXible nature; and my invention has for its primary object to provide eiiicient and simple means for holding sheets of material of the described character while it is being subjected to a drying operation in such a manner as to prevent it from warping or buckling and at the same time utilize the strain resulting' from the shrinkage for compressing and straightening the material.

With these ends in view my invention consistsin certain features of novelty in the construction, combination, and arrangement of parts by which the said objects and certain other objects hereinafter. appearing are attained, all as fully described with reference to the accompanying drawings, and more particularly pointed out in the claims.

In the said drawings, Figure 1 is a vertical sectional view of my improved apparatus, taken on the line l 1, Fig. 6. Fig. 2 is a side elevation of the drying-frame with the clamps omitted. Fig. 3 is an enlarged detail sectional view of one edge of the dryingframe, showing the manner of holding the wire-cloth, hereinafter described. Fig. 4 is a plan section of the apparatus, taken on the line 4 4, Fig. 5. Fig. 5 is a cross-section taken on the line 5 5, Figs. 4 and 6. Fig. 6 is a plan view, partly'in plan section, on the line 6 6, Fig. 5. Fig. 7 is an enlarged detail side elevation of one 0f the segments forl holding one of the clamps, the clamp and part of the frame being shown in section, the clamp being released or in its elevated position. Fig. 8 is a sectional view thereof on the line 8 8, Fig. 7; and Fig. 9 is a similar section on the line 9 9, Fig. 7.

1 is a bench, table, or other suitable support upon which is placed one of the pieces of board 2 3 to be dried, two of such pieces `of board being' usually dried at one time.

Upon this piece of board 2 as it lies flat upon the table or bench l is placed a holding and drying frame, which I will now describe. This frame comprises a rectangular frame portion 4, each side of which in cross-section has the form oi' a channel-bar or U laid on its side, with the open side inward, and the in- .ner edges thereof at top and bottom are secured in any suitable way to two diaphragms or sections of wire gauze or screen 5 6, respectively, the lower one ot which rests fiat upon the lower board 2, while the upperone constitutes the support for the upper board 3. These wire screens may be secured to the edges of the'frame 4'in any suitable way. I have shown the edges of the frame Abent inwardly to form U-shaped lianges 7, in

interior of the drying-frame may be raised to` the proper temperature for driving off the moisture contained in the boards 2 3, the wire screens or sheets of gauze 5 6 aording a substantially smooth surface for the boards to be compressed against, while at the same time permitting' the heat to penetrate through to the boards and also permitting a large percentage of the moisture on the inner sides of the boards to escape into the drying-frame, whence it iinds its way to theexternal atmosphere through suitable apertures l1 formed through the sides of the rectangular frame 4. In order that this drying-frame may be removed from the table or support 1 and conducted into any. suitable drying-kiln, whereby the two pieces of board may be simultaneously subjected to the drying action of the external heat afforded by the kiln and the internal heat afforded by the pipes or coils 8 while the boards are held securely on the frame, each side of the rectangular frame 4 IOO is provided with a clamping-bar for holding the edges of the boards while the frame is being thus transported. These clamps are composed of channel-bars or other substantially U-shaped bars 12, ,secured to the rectangular frame 4 by set-screws 13 and thumbnuts 14, the set-screws passing through the frame 4 and channel-bars 12 between the edges of the boards where they are turned inwardly or toward each other at the sides of the frame 4, so that one edge of each bar or clamp 12 may impinge the edge of one of the boards andthe other edge may impinge the edge of the other board in a manner more clearly shown in Fig. 1, thus securely holding both boards on the drying-frame. In order, however, that the edges of the boards may be thus turned down within reach of the clamps 12 and held in position while the clamps are being adjusted, the table 1 is provided on each of its four sides-with .a clampL 15, hinged at 16 to theedge of the table and provided with an operating-.lever 17, whereby the clamp 15 may be turned from a horizontal to a vertical position for forcing the edge of the lower board up against the side of theframe 4. After the upper board 3 has been put in placeonthe top of the drying-frame it is firmlycompressed thereagainst by a platen or clamping member 18, and each of the four edges of this platen or clamping member 14 is also provided with a clamp 19 similar to the clamp 15, excepting that it turns downwardly to force the edges of the upper board 3 down against the side of the frame 4, the clamp 19 being hinged at 2O to the platen 18 and provided with an operatinglever 21. These two levers 17 21 may be held in place by any suitable means, such as toothed segments 22 23, respectively secured to the table 1 and platen 18 and arranged in such a position with relation to the lever 17 21 as to be engaged by a tooth or dog 24, formed on or secured to the contiguous side of the lever, the lever being sufficiently elastic to spring out of engagementwhen it is desired to release it.

After the boards have been clamped down over the edges of the frame 4 the clamps 12 are forced inwardly between the edges of the clamps 15 19 until they impinge the edges of the board with sufficient firmness to hold the latter while drying and shrinking, clamps`15 19 being a sufficient distance apart to permit the clamps 1.2 to engage the edges of the board between them. After this has been'aceomplished the clamps 15 19 are released, the platen 18 elevated, and the drying-frame, with the board thus secured to it, conducted into the drying-kiln or any other place where the board is to be dried or cured. As a convenient means of elevating the platen 18 I provide the same with two shafts 25, having heads 26 at their lower ends rotatably connected with the platen, while their upper ends In order that the wire screens 5 6 may have adequate support, slats or strips 35 may be arranged at suitable intervals between them, and in order that the great strain produced by the shrinkage of the boards 2 3 may not bend or distort the rectangular frame 4 these slats or strips are carried entirely across the frame in the form of projections 35 and abutted against the inner sides of the frame 4 on two sides thereof, while the other two sides of the frame 4 are 'braced by cross-slats or blocks 36 37, the former of which are interposed between two outer slats 35 and the sides of the frame 4, while the latter, 37, are interposed between the intermediate slats 35 and, if desired, have their ends mortised therewith, as shown in Figs. 1 and 4, the blocks 36 37 being of less depth-than the slats 35, so as to leave room for the steam-coil 8 and afford ample circulation, the steam-coil being preferably arranged at the bottom of the drying-frame, so that the lower board will be subjected approximately to the same degree of heat as the upper one.

I-Iaving thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

l. In a device for the purpose described the combination of a drying-frame, means for heating said frame internally and means at the edges of said frame for clamping the edges of the board to be dried thereon, substantially as set forth.

2. In a device for the purpose described the combination of a hollow ventilated frame pervious to air and heat, means for heating said frame internally and clamping means at the edges of the frame for holding the edges of the board to be dried thereon, substantially as set forth. v

3. In a device for the purpose described the combination of a hollow portable dryingframe pervious to air and heat, means within said frame for heating it internally and means for securing the edges of the board to be dried on said frame, substantially as set forth.

4. In a device for the purpose described the combination of a drying-frame adapted to have two pieces of board secured against opposite sides thereof with their edges folded down against the edges of the frame, and clampingbars adjustably secured to the edges of the frame and each overlapping and pinching one edge of each of said boards, substantially as set forth. 'r

5. In a device for the purpose described the combination of a hollow drying-frame having apertures in the sides thereof for the escape IOO IIO

IIS

of heat and moisture and hollow ventilated clamping-bars secured to the sides of said frame over said apertures and adapted to pinch the edges of boards to be dried on said frame, substantially as set forth.

6. In a device for the purpose described the combination of a drying-frame, clamps for turning down the edges of a board to be dried on said frame and additional clamps independent of said rst clamps, secured to said frame for impinging and holding the edges of said board, substantially as set forth.

7. In a device for the purpose described the combination of a drying-frame, hinged clamps independent of said frame for turning the n edges of a board to be dried on said frame and clamps independent of said Erst clamps, secured to said frame, for impinging and holding the edges of the board as turned by said first clamps, substantially as set forth.

8. In a device for the purpose described the combination of a table or support, a dryingframe adapted to be supported thereon, clamps hinged to said table or support for turning the edges of a board against the edges of said frame, and clamps secured to the edges of said frame for clamping the edges of the board as turned by said first clamps, substantially as set forth.

9. In a device for the purpose described the combination of a drying-frame, a support therefor, a platen movable with relation to the upper side of said frame for clamping a' hoard to be dried thereupon, and means for securing the edges of said board to said frame, said means being independent of said platen, substantially as set forth.

l0. In adevice for the purpose described the combination of a drying-frame, a support therefor, aplaten movable with relation to said frame and adapted to clamp a board to be dried thereon, clamps movable with said platen for turning the edges of said board against the sides of said frame and means independent of said clamps for holding the edges of the board while on the frame, substantially as set forth.

l1. In a device for the purpose described the combination of a drying-frame, a support therefor, hinged clamps for turning the edges of a board to be dried on said frame against the sides of the latter, said clamps being independent of said frame, levers for actuating said clamps, toothed segments for locking said levers, and means for securing the edges of said board to said frame, substantially as set forth. f

l2. In a device for the purpose described the combination of a hollow drying-frame having opposed sides composed of screens, supporting-slats within said frame'for reinforcing said screens, means within said frame for heating it internally and means for securing a board to be dried on the exterior of said frame, substantially as set forth.

13. In a device for the purpose described the combination of a rectangular hollow frame, wire screens or diaphragms connecting the sides of said rectangular frame together and arranged iiush with the outer surfaces thereof for constituting surfaces upon which to dry paper board, means for supporting said screens within, means for heating the space between said screens and means for clamping the boards upon said frame and screens, substantially as set forth.

THOMAS W. MCFARLAND.

Witnesses:

M. B. ALLSTADT, W. D. CRoss. 

